The Dome

Prospect in Alaska, United States with commodities Copper, Lead

Geologic information

Identification information

Deposit ID 10094004
MRDS ID A011840
Record type Site
Current site name The Dome
Related records 10186043

Geographic coordinates

Geographic coordinates: -144.08263, 62.80968 (WGS84)
Relative position The prospect is on the top and on the north side of The Dome, a prominent isolated mountain on the west side of Ahtell Creek. The prospect is in the SE1/4NW1/4, section 22, T. 12 N., R. 7 E., Copper River Meridian. The prospect is correctly located as number 3 on figure 5 of Richter (1966). It was mislocated by 1.2 miles as locality 7 of Richter and Matson (1972).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Lead Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Calcite Gangue
Limonite Gangue
Quartz Gangue

Alteration

  • (Local) Quartz-sericite-pyrite alteration of the intrusive rocks is present on the northeast side of The Dome.

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Hornfels

Nearby scientific data

(1) -144.08263, 62.80968

Comments on the geologic information

  • Geologic Description = The Dome prospect consists of veins and disseminated ore minerals in hornfelsed flows and possibly interbedded tuffs of the Pennsylvanian, Slana Spur Formation and in intrusive rocks of the Pennsylvanian to Permian, Ahtell Pluton (Richter, 1966; Richter Lanphere and Matson 1975; and Beard and Barker, 1989).? the silicic border phase of the Ahtell pluton contains stockworks of weakly metalliferous, quartz-calcite veins. The veins are as much as one foot thick and occupy joint sets. The predominant joint set strikes slightly west of north and dips moderately to the west. The veins contain sparse disseminated pyrite, chalcopyrite, and galena. The volcanic rocks also contain limonitic, hornfelsed volcanic rocks; the limonite probably formed by the oxidation of pyrite and chalcopyrite. A composite sample of an area about 400 feet by 100 feet in size contained from 0.05 to 0.1 percent copper (Richter, 1966, p. 31).
  • Age = Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Chistochina

Comments on the workings information

  • Workings / Exploration = Mineral deposits exposed in shallow pits (Richter, 1964, 1966).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011840
USGS Alaska Resource Data File ARDF GU024

Bibliographic references

  • Deposit

    Richter, D.H., 1964, Geology and mineral deposits of the Ahtell Creek area, Slana District, south-central Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 6, 17 p., 1 sheet, scale 1:31,680.

  • Deposit

    Richter, D.H., 1966, Geology of the Slana district on south-central Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 2l, 36b p., 3 sheets, scale 1:63,360.

  • Deposit

    Richter, D.H., 1975, Reconnaissance geologic map of the Nabesna B-3 quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-904, scale 1:63,360.

  • Deposit

    Richter, D.H., Lanphere, M.A., and Matson, N. A., Jr., 1975, Granite plutonism and metamorphism, Eastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820.

  • Deposit

    Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Gulkana quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1247, 36 p.

  • Deposit

    Beard, J.A., and Barker, Fred, 1989, Petrology and tectonic significance of gabbro, tonalites, shoshonites, and anorthosites in a late Paleozoic arc-root complex in the Wrangellia terrane, Southern Alaska: Journal of Geology, v. 97, p. 667-683.

  • Deposit

    Nokleberg, W.J., and others, 1994, Metallogeny and major mineral deposits of Alaska and Metallogenic map of significant metalliferous lode deposits and placer districts of Alaska, in Plafker, G. and Berg, H.C., eds., The Geology of Alaska: Boulder, Colorado, Geological Society of America: The Geology of North America, v. G1, p. 855-904 and v. G1, Plate 11, scale 1:2,500,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Richter, D.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Gulkana quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-419, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Richter, 1966

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu (Cox and Singer, 1986; model 17)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-00 W.T. Ellis Alaska Earth Sciences
Reporter 01-DEC-00 Hawley, C.C. Hawley Resource Group
Reporter 01-DEC-00 W.J. Nokleberg U.S. Geological Survey